Roasting-furnace.



Patented Oct. l4, I902. D. SHEEDY & M. W. ILES.

BOASTING FURNACE. (Application filed Apr. 14,1397.

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No. 7||,352. Patented on. M, I902. n. SHEEDY & m. w. ILES.

BUASTING FURNACE.

(Application filed Apr. 14, 1897.)

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Witnesses. Q g Inventor: 7K in 22:9; Attorney.

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llrrnn STATES AIFNT OFFICE.

DENNIS SIIEEDY AND MALVERN W. ILES, OF DENVER, COLORADO.

ROASTING- FURNACE.

SPECIFICATION forming part of Letters Patent No. '71 1,352, datedOctober 14, 1902. Application filed April 14. 1897. Serial No. 632.079.(N0 model-l To all whom it nuty concern:

Be it known that we, DENNIS SHEEDY and MALVERN W. ILES, citizens of theUnited States of America, residing in Denver, in the county of Arapahoe,in the State of Colorado, have invented a certain new and usefulImprovement in Furnaces, of which the following is a true and exactdescription, reference being had to the accompanying drawings, whichform a part-thereof.

Our invention relates to the construction of furnaces, and particularlyto what may be called mechanical furnaces, such as are used forcalcining and roasting all classes of ores, including the so-calledchloridizing roasting and the roasting to sulfates and drying ofmaterials.

The objects of our invention are to provide an improved method ofconstruction whereby the arch or top of the furnace is entirelysuspended from above and whereby the stirring and conveying devices canbe extended laterally outside the walls of the furnace and supportedupon tracks or other mechanical construction situated outside of thefurnace.

A further object of our invention is to pro vide means for keeping thestirring and conveying devices cooled, so as to prevent theirdestruction by the action of the furnace-heat and corrosive gases uponthem.

Reference being now had to the drawings which illustrate ourimprovements in what we consider to be their best form, Figure 1 is aplan View of the furnace constructed in accordance with our invention;Fig. 2, a side elevation thereof; Fig. 3, a cross-section taken on theline 0000 of Fig. 2 and shown on an enlarged scale; Fig. 4, a view of aportion of one of the stirring and conveying devices shown on a stillmore enlarged scale.

A indicates the bottom or floor of the furnace, which, as shown, isinclosed on each side by brick walls B B, O being a filling beneath thefloor A.

D D indicate brick buttresses built up between the Walls B and thecolumns F F, which last-mentioned columns extend, as shown, above thetop of the furnace, E E being castiron plates situated at intervals ontop of the buttresses D, and E a continuous iron angle situated on topof wall B. Upon the top of the columns F F are cross-beams G G, &c.,

connecting the columns in pairs and extend ing across the furnace.

F F, &c., indicate angular braces secured to the columns F and to thebeams G.

H and H are heavy tie-rods situated near the top and near the bottom ofthe columns .FF and serving to tie or anchor the columns together, so asto overcome the tendency to spread or push them apart.

J J indicate a series of suspension-rods which are supported by thebeams I, extending continuously between adjacent beams G' and supportedby them. The suspension-rods support at their lower ends angles L, whichangles are braced to prevent outward thrust by continuous beams orbraces K K, situated between the angles L and the columns F. As shown, Mis the top arch of the furnace, which is supported at each side upon theangles L L and suspended by rods J upon the cross-beams G, as shown,being attached directly to the beams I.

H H indicate longitudinal tie-rods for bold ing the furnace togetherlongitudinally.

N indicates a track supported above the cross-beams G; N, acorresponding track supported on the plates E outside of the furnace.

O is a conveyer chain or rope, which may be of any convenientconstruction and to which are attached the stirring and conveyingdevices. \Ve prefer to make the axle of hollow pipe, havingdownwardly-extending rabbles Q attached to the pipe P. The outer ends ofthe pipes pass, through the continuous slot S S, situated on each sideof the furnace between the base and the suspended top or arch of thefurnace, and these slots, as well as the openings under the arch at eachend of the furnace, are closed by anysuitable automatic closing-doors.

R R indicate wheels journaled upon the outer ends of the hollow pipesPand adapted to run upon the track N and N, as shown. Both the outer endsof the pipesl are open to the air, and we form small openings at or nearthe center of the pipe, as indicated atp, as a result of which a currentof air is always passinginto the outerends of the hollow pipes andissuing into the furnace through the openingsp, with, of course, theresult of keeping the pipes relatively cool and prolonging their life.

The cooling device is considered to be an improvement upon similarlyconstructed cooling devices in so far as the air may enter freely bothends of the pipe irrespective of the direction of the wind and likewiseperforms a useful function in admitting oxygen at that portion of thefurnace where it is most needed and which supply of air is Wholly withincontrol of the operator. In case oxygen is not needed at the centralportion of the furnaces (as is the case in certain processes) then theholes p may be closed and we would still retain the desired coolingeffect by a current of air passing freely through the pipe withoutentering the furnace.

T T indicate platforms supported upon the cross-beams G upon each sideof the tracks'N.

'1" T are hand-rails.

U indicates a device for imparting motion to the conveyer ropes orchains 0, which may conveniently consist of sprocket wheels driven inany convenient way, U indicating chainor rope wheels situated at theother end of the furnace and preferably supported upon a compensatingdevice which will keep the conveyer chains or ropes 0 under constanttension. Thus, as shown, the chain-wheels U are supported on alongitudinally-movable frame U from which extends a cable, passing overpulleys U and having attached to its end a compensating weight U V is ahopper into which the ore or other material to be treated in the furnaceis fed. As shown, a track V leads above this hopper, so that ore-carsmay be dumped directlyinto it, and at the bottom of the hopper we haveindicated pipe-rolls V which are sometimes desirable where the lumpy oreneeds to be broken before entering the furnace. Below the rails V achute V is shown leading through the arch of the furnace.

Our furnace may be heated in any usual way. As shown, we place at itsend a ointering-furnace W. The floor or hearth of the furnace proper iscontinued beyond its end onto cast-iron plates A, through which areformed slots A and A leading intov hoppers W and W which in turn leadinto the cintering-furnace W, which may or may not be attached thereto.The gases from the cintering-furnace W pass into a fine W thence intoside flues W which curve inward and enter through the crown or arch ofthe furnace. The gases then sweep through the furnace in the oppositedirection to that in which the ore is moved and finally pass out throughthe arch at Y, passing through side flues into a flue Y, from which aflue Y leads to any suitable exit, the draft being induced by a stack orfan.

Having now described our invention,what we claim as new, and desire tosecure byLetters Patent, is-- 1. A furnace adapted for roasting, drying,calcining and chloridizing of ores and other materials having incombination, a base or hearth, a frame extending over the. sides and topof said base, angles L L supported by depending rods J J the upper endsof which are secured to the parts of the frame extending over the top ofthe base,-and laterally braced by the vertical parts of said frame, afixed top supported on said angles and entirely suspended from saidframe, an endless carrier and conveying device extending longitudinallybeneath and above the fixed top and means for moving said carrier.

2. A furnace adapted for roasting, drying, calcining and chloridizing ofores and other materials having in combination, a base or hearth, aframe extending over the sides and top of said base, anglesL L supportedby depending rods JJ the upper ends of which are secured to the parts ofthe frame extending over the top of the base, and laterally braced bythe vertical parts of said frame, a fixed top supported on said anglesand entirely suspended from said frame and disconnected from the baseand at such a distance above the same as to afford continuous openingson both sides for the passage of stirring and conveying devices, endlesscarriers connected with the ends of the stirring and conveying devicesoutside the furnace and extending over the fixed top and means foractuating said carriers.

3. A furnace adapted for roasting, drying, calcining and chloridizing ofores and other materials having in combination, a base or hearth, aframe extending over the sides and top of said base, anglesL Lsupported. by depending rods J J- the upper ends of which are secured tothe parts of the frame extending over the top of the base, and laterallybraced by the vertical parts of said frame, a fixed top supported onsaid angles and entirely suspended from said frame and disconnected fromthe base and at such a distance above the same as to afford continuousopenings on both sides for the passage of stirring and conveyingdevices, transverse scrapers and stirrers passing through the lateralopenings on each side of the furnace, endless carriers 0 0, one on eachside of the furnace, connected with the scrapers and extending back overthe fixed top, tracks or continuous supports also situated on each sideof the furnace, and bearings for the outer ends of the scraperssupported and moving on said tracks.

4. In combination with afurnace Z having its top M entirely suspendedfrom above and continuous lateral openings S S between the top and baseof the furnace; aconveyer having the hollow pipes P extending throughthe openings S and having'both their outer ends open, and openings, asp, at or near the center of the furnace. DENNIS SHEEDY. MALVERN W. ILES.WVitnesses:

JNO. S. WILLIAMS, PERRY R. MCCORMICK.-

